In ancient texts 顷 is sometimes used where modern Chinese writes 倾, meaning 'to tilt'.
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usage
In the qīng reading 顷 is an archaic variant of 倾 (倾, 'to lean, tilt'). Modern Chinese uses 倾 for this sense; you will only meet 顷 read qīng in classical texts.
页 is the 'head' radical (its original sense, not 'page'). With the tilted figure beside it, the character first meant an inclined head, later borrowed for the area unit and the 'brief moment' sense.
匕 here depicts a person with the head tilted. Combined with 页 (页, head), the original picture is a head leaning to one side — the 'tilt' sense that the qīng reading still carries.
